Security Updates for Microsoft SharePoint Server 2019 (January 2026)

critical Nessus Plugin ID 283475

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Synopsis

The Microsoft SharePoint Server 2019 installation on the remote host is affected by multiple vulnerabilities.

Description

The Microsoft SharePoint Server 2019 installation on the remote host is missing security updates. It is, therefore, affected by multiple vulnerabilities:

- A remote code execution vulnerability. An attacker can exploit this to bypass authentication and execute unauthorized arbitrary commands. (CVE-2026-20948, CVE-2026-62551, CVE-2026-62563)

- A session spoofing vulnerability exists. An attacker can exploit this to perform actions with the privileges of another user. (CVE-2026-20958)

- A information disclosure vulnerability exists. An authorized attacker could use this to disclose information over a network (CVE-2026-20959)

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

Solution

Microsoft has released security updates to address this issue.

Plugin Details

Severity: Critical

ID: 283475

File Name: smb_nt_ms26_jan_office_sharepoint_2019.nasl

Version: 1.1

Type: local

Agent: windows

Family: Windows : Microsoft Bulletins

Published: 1/13/2026

Updated: 1/13/2026

Supported Sensors: Nessus Agent, Nessus

Risk Information

VPR

Risk Factor: High

Score: 8.4

CVSS v2

Risk Factor: Critical

Base Score: 10

Vector: CVSS2#AV:N/AC:L/Au:N/C:C/I:C/A:C

CVSS Score Source: CVE-2026-20948

CVSS v3

Risk Factor: Critical

Base Score: 9.8

Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Vulnerability Information

CPE: cpe:/a:microsoft:sharepoint_server:2019

Required KB Items: SMB/MS_Bulletin_Checks/Possible

Patch Publication Date: 1/13/2026

Vulnerability Publication Date: 1/13/2026

Reference Information

CVE: CVE-2026-20943, CVE-2026-20948, CVE-2026-20951, CVE-2026-20958, CVE-2026-20959, CVE-2026-20963

MSFT: MS26-5002825

MSKB: 5002825

Detections

Analytics